Ratio of heterozygosity to homozygosity for each of the Western black widow spider (Latrodectus hesperus) chromosomes between sexes. Each chromosome shows the ratio estimates for the datasets of one female and two male spiders. Ratios of heterozygosity to homozygosity on chromosomes 6 and 9 are reduced compared to other chromosomes for the male datasets compared to the female dataset, reflecting the two putative sex chromosomes. Heterozygosity ratios were averaged across a sliding window of 200,000 bp.